제출 #730869

#제출 시각아이디문제언어결과실행 시간메모리
730869rainboyXOR (IZhO12_xor)C11
100 / 100
125 ms24272 KiB
#include <stdio.h> #define N 250000 #define L 30 /* L = ceil(log2(10^9)) */ #define N_ (N * L + 2) int min(int a, int b) { return a < b ? a : b; } int tt[N_][2], ii[N_], _ = 2; int main() { static int aa[N + 1]; int n, x, i, j, i_, j_, l, a, c, t, u; scanf("%d%d", &n, &x); for (i = 1; i <= n; i++) scanf("%d", &aa[i]), aa[i] ^= aa[i - 1]; i_ = j_ = -1; for (j = 0; j <= n; j++) { i = j; a = aa[j]; for (l = L - 1, t = 1; l >= 0; l--) { c = a >> l & 1; if ((x & 1 << l) == 0) { if ((u = tt[t][c ^ 1])) i = min(i, ii[u]); t = tt[t][c]; } else t = tt[t][c ^ 1]; } if (t) i = min(i, ii[t]); for (l = L - 1, t = 1; l >= 0; l--) { c = a >> l & 1; if (!tt[t][c]) ii[tt[t][c] = _++] = j; t = tt[t][c]; } if (i < j && j_ - i_ < j - i) i_ = i, j_ = j; } printf("%d %d\n", i_ + 1, j_ - i_); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

xor.c: In function 'main':
xor.c:15:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%d%d", &n, &x);
      |  ^~~~~~~~~~~~~~~~~~~~~
xor.c:17:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d", &aa[i]), aa[i] ^= aa[i - 1];
      |   ^~~~~~~~~~~~~~~~~~~
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